It has been discussed in a private forum here about Comcast being caught out attempting to block p2p programs. This may be your issue, but not necessarily.

In meantime, try these things:
1. Delete your LW prefs folder whilst LW is CLOSED. See instructions here: Deleting LW Preferences folder in OSX. Be sure to make a note of all your settings before you do this because next time you open LW you will need to re-set your download location, speed, etc.

2. (a) Problems with the search, __ (b) Hostiles List